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Defects and Diffusion Forum, France (2012)
Surface blistering and flaking of sintered uranium dioxide samples under high dose gas implantation and annealing
Guillaume Martin1, Gaëlle Carlot1, Pierre Desgardin2, Marylène Vayer3, Claire Ramboz4, Thierry Sauvage2, Philippe Moretto5, Hicham Khodja6, Philippe Garcia1

High helium contents will be generated within minor actinide doped uranium dioxide blankets which could be used in fourth generation reactors. In this framework, it is essential to improve our understanding of the type of damage which a pellet could incur as a result of extensive helium build-up. This paper is an attempt at tackling this issue. Sintered uranium dioxide disks have been implanted with helium ions then annealed at various temperatures. Above a concentration of 0.4 at.% and above 1000°C, optical images of the sample surface revealed swollen grains and extensive areas which have exfoliated. Nuclear reaction microanalyses and atomic force microscopy observations were performed to demonstrate that helium has substantially precipitated within the swollen grains. Massive precipitation of the gas leads under these conditions to sample surface blistering which appears to precede flaking. Deuterium ion irradiations have also been performed at ambient and a direct flaking of the sample surface was observed, but for this phenomenon to be observed required much higher doses than in the He study, indicating that temperature could be an essential ingredient for gas to migrate and cause extensive precipitation. Such phenomena could possibly lead to degradation of the fuel.
1 :  CEA
2 :  CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
3 :  CRMD - Centre de Recherche sur la Matière Divisée
4 :  GéhCO EA6293 - GéoHydrosystèmes COntinentaux
5 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
6 :  Laboratoire d'étude des Éléments Légers
Planète et Univers/Sciences de la Terre/Minéralogie
uranium dioxide – helium – hydrogen – implantation – blistering – flaking
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